<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="handler">修改基本类型数据</button>
        <p>数据展示{{msg}}</p>
    </div>
    <script>
        Vue.config.productionTip = false;
        
        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    msg:"hello"
                }
            },
            methods: {
                handler(){
                    console.log(this);
                     /* 
              如何响应式的修改data数据:
                - 基本类型值直接修改即可(其实是重新赋值),是拥有响应式的
            */
            // this.msg = "bye Vue";
            this.$data.msg = "bye"
                }
            },
        })
</script>
</body>

</html>